3K: py3tool: use lib2to3 for the conversions
3K: py3tool: use lib2to3 for the conversions

This ensures that the Py3 version of 2to3 is always used, and that
failures in conversion result to an immediate build failure.

dch312/numpy,ChanderG/numpy,jakirkham/numpy,mingwpy/numpy,immerrr/numpy,matthew-brett/numpy,rhythmsosad/numpy,sigma-random/numpy,kiwifb/numpy,endolith/numpy,rmcgibbo/numpy,ekalosak/numpy,mortada/numpy,dwillmer/numpy,behzadnouri/numpy,ViralLeadership/numpy,Srisai85/numpy,shoyer/numpy,hainm/numpy,Srisai85/numpy,Eric89GXL/numpy,MSeifert04/numpy,rudimeier/numpy,pbrod/numpy,groutr/numpy,SiccarPoint/numpy,rajathkumarmp/numpy,BabeNovelty/numpy,nbeaver/numpy,NextThought/pypy-numpy,hainm/numpy,dato-code/numpy,mwiebe/numpy,mindw/numpy,utke1/numpy,jonathanunderwood/numpy,groutr/numpy,abalkin/numpy,GaZ3ll3/numpy,anntzer/numpy,dimasad/numpy,ddasilva/numpy,ContinuumIO/numpy,argriffing/numpy,pbrod/numpy,kirillzhuravlev/numpy,tdsmith/numpy,rhythmsosad/numpy,embray/numpy,ssanderson/numpy,Linkid/numpy,ewmoore/numpy,Anwesh43/numpy,larsmans/numpy,CMartelLML/numpy,simongibbons/numpy,AustereCuriosity/numpy,grlee77/numpy,madphysicist/numpy,Yusa95/numpy,NextThought/pypy-numpy,tynn/numpy,grlee77/numpy,stefanv/numpy,dwf/numpy,ddasilva/numpy,GaZ3ll3/numpy,mathdd/numpy,felipebetancur/numpy,MaPePeR/numpy,anntzer/numpy,mattip/numpy,KaelChen/numpy,jorisvandenbossche/numpy,mwiebe/numpy,empeeu/numpy,gfyoung/numpy,immerrr/numpy,yiakwy/numpy,sigma-random/numpy,MSeifert04/numpy,has2k1/numpy,SiccarPoint/numpy,embray/numpy,tacaswell/numpy,maniteja123/numpy,bertrand-l/numpy,githubmlai/numpy,maniteja123/numpy,Srisai85/numpy,ewmoore/numpy,jankoslavic/numpy,dwillmer/numpy,dwillmer/numpy,Yusa95/numpy,Dapid/numpy,skwbc/numpy,musically-ut/numpy,Eric89GXL/numpy,dimasad/numpy,jakirkham/numpy,b-carter/numpy,jorisvandenbossche/numpy,rherault-insa/numpy,pdebuyl/numpy,GaZ3ll3/numpy,mortada/numpy,CMartelLML/numpy,tynn/numpy,ewmoore/numpy,ekalosak/numpy,skymanaditya1/numpy,MaPePeR/numpy,chiffa/numpy,githubmlai/numpy,anntzer/numpy,utke1/numpy,immerrr/numpy,numpy/numpy,WillieMaddox/numpy,MSeifert04/numpy,pdebuyl/numpy,kiwifb/numpy,simongibbons/numpy,empeeu/numpy,nguyentu1602/numpy,ChristopherHogan/numpy,tynn/numpy,nguyentu1602/numpy,dato-code/numpy,mindw/numpy,leifdenby/numpy,mhvk/numpy,dch312/numpy,jakirkham/numpy,yiakwy/numpy,endolith/numpy,seberg/numpy,gmcastil/numpy,pyparallel/numpy,has2k1/numpy,joferkington/numpy,has2k1/numpy,hainm/numpy,Anwesh43/numpy,Dapid/numpy,astrofrog/numpy,stuarteberg/numpy,gmcastil/numpy,chiffa/numpy,ChanderG/numpy,WarrenWeckesser/numpy,mingwpy/numpy,dwf/numpy,pdebuyl/numpy,cjermain/numpy,argriffing/numpy,BabeNovelty/numpy,SunghanKim/numpy,skwbc/numpy,ogrisel/numpy,empeeu/numpy,rmcgibbo/numpy,MSeifert04/numpy,ContinuumIO/numpy,mortada/numpy,jankoslavic/numpy,sonnyhu/numpy,ekalosak/numpy,hainm/numpy,sinhrks/numpy,mingwpy/numpy,brandon-rhodes/numpy,stefanv/numpy,empeeu/numpy,charris/numpy,musically-ut/numpy,matthew-brett/numpy,rhythmsosad/numpy,endolith/numpy,ogrisel/numpy,CMartelLML/numpy,joferkington/numpy,rgommers/numpy,WillieMaddox/numpy,rhythmsosad/numpy,ContinuumIO/numpy,BMJHayward/numpy,sonnyhu/numpy,tdsmith/numpy,matthew-brett/numpy,MichaelAquilina/numpy,argriffing/numpy,GrimDerp/numpy,brandon-rhodes/numpy,stefanv/numpy,trankmichael/numpy,MichaelAquilina/numpy,immerrr/numpy,pyparallel/numpy,shoyer/numpy,BabeNovelty/numpy,jonathanunderwood/numpy,embray/numpy,bmorris3/numpy,jschueller/numpy,endolith/numpy,brandon-rhodes/numpy,chatcannon/numpy,GrimDerp/numpy,numpy/numpy-refactor,dwillmer/numpy,matthew-brett/numpy,musically-ut/numpy,WarrenWeckesser/numpy,yiakwy/numpy,ChristopherHogan/numpy,solarjoe/numpy,rherault-insa/numpy,BMJHayward/numpy,AustereCuriosity/numpy,nbeaver/numpy,chatcannon/numpy,andsor/numpy,ESSS/numpy,dch312/numpy,githubmlai/numpy,BMJHayward/numpy,trankmichael/numpy,skymanaditya1/numpy,Anwesh43/numpy,andsor/numpy,rajathkumarmp/numpy,naritta/numpy,cowlicks/numpy,trankmichael/numpy,stefanv/numpy,skwbc/numpy,cowlicks/numpy,grlee77/numpy,dato-code/numpy,b-carter/numpy,bertrand-l/numpy,KaelChen/numpy,embray/numpy,dimasad/numpy,sinhrks/numpy,groutr/numpy,chiffa/numpy,cjermain/numpy,grlee77/numpy,cjermain/numpy,ChristopherHogan/numpy,mindw/numpy,mattip/numpy,rudimeier/numpy,matthew-brett/numpy,dato-code/numpy,pizzathief/numpy,pizzathief/numpy,seberg/numpy,ahaldane/numpy,abalkin/numpy,jorisvandenbossche/numpy,numpy/numpy,naritta/numpy,ssanderson/numpy,mortada/numpy,GrimDerp/numpy,musically-ut/numpy,charris/numpy,mathdd/numpy,ajdawson/numpy,MichaelAquilina/numpy,jankoslavic/numpy,pbrod/numpy,naritta/numpy,rmcgibbo/numpy,skymanaditya1/numpy,skymanaditya1/numpy,andsor/numpy,madphysicist/numpy,Linkid/numpy,AustereCuriosity/numpy,pelson/numpy,jschueller/numpy,dwf/numpy,KaelChen/numpy,ajdawson/numpy,abalkin/numpy,kirillzhuravlev/numpy,b-carter/numpy,cjermain/numpy,numpy/numpy-refactor,gfyoung/numpy,pizzathief/numpy,cowlicks/numpy,ChanderG/numpy,tacaswell/numpy,ogrisel/numpy,drasmuss/numpy,rgommers/numpy,ESSS/numpy,ahaldane/numpy,astrofrog/numpy,githubmlai/numpy,Linkid/numpy,larsmans/numpy,madphysicist/numpy,mwiebe/numpy,njase/numpy,rajathkumarmp/numpy,leifdenby/numpy,pyparallel/numpy,kirillzhuravlev/numpy,bringingheavendown/numpy,NextThought/pypy-numpy,joferkington/numpy,SunghanKim/numpy,trankmichael/numpy,pizzathief/numpy,jankoslavic/numpy,nbeaver/numpy,stuarteberg/numpy,bmorris3/numpy,jorisvandenbossche/numpy,MaPePeR/numpy,nguyentu1602/numpy,numpy/numpy-refactor,kirillzhuravlev/numpy,mattip/numpy,ssanderson/numpy,mindw/numpy,SunghanKim/numpy,jonathanunderwood/numpy,SiccarPoint/numpy,mattip/numpy,has2k1/numpy,behzadnouri/numpy,GrimDerp/numpy,WillieMaddox/numpy,numpy/numpy-refactor,tdsmith/numpy,felipebetancur/numpy,numpy/numpy,Yusa95/numpy,BabeNovelty/numpy,SiccarPoint/numpy,shoyer/numpy,rmcgibbo/numpy,ddasilva/numpy,seberg/numpy,mhvk/numpy,drasmuss/numpy,ewmoore/numpy,astrofrog/numpy,Yusa95/numpy,simongibbons/numpy,sonnyhu/numpy,moreati/numpy,pbrod/numpy,mhvk/numpy,jorisvandenbossche/numpy,WarrenWeckesser/numpy,bmorris3/numpy,simongibbons/numpy,KaelChen/numpy,naritta/numpy,felipebetancur/numpy,mathdd/numpy,ajdawson/numpy,CMartelLML/numpy,njase/numpy,sonnyhu/numpy,jschueller/numpy,anntzer/numpy,numpy/numpy,numpy/numpy-refactor,dwf/numpy,embray/numpy,astrofrog/numpy,rgommers/numpy,pelson/numpy,ChristopherHogan/numpy,MaPePeR/numpy,tdsmith/numpy,larsmans/numpy,njase/numpy,ogrisel/numpy,simongibbons/numpy,WarrenWeckesser/numpy,yiakwy/numpy,joferkington/numpy,charris/numpy,pizzathief/numpy,WarrenWeckesser/numpy,bringingheavendown/numpy,MSeifert04/numpy,moreati/numpy,Eric89GXL/numpy,rajathkumarmp/numpy,mhvk/numpy,jschueller/numpy,tacaswell/numpy,chatcannon/numpy,ahaldane/numpy,sigma-random/numpy,gmcastil/numpy,Dapid/numpy,astrofrog/numpy,Linkid/numpy,Srisai85/numpy,felipebetancur/numpy,brandon-rhodes/numpy,larsmans/numpy,NextThought/pypy-numpy,BMJHayward/numpy,pelson/numpy,MichaelAquilina/numpy,dch312/numpy,mhvk/numpy,jakirkham/numpy,bertrand-l/numpy,bmorris3/numpy,pelson/numpy,moreati/numpy,cowlicks/numpy,SunghanKim/numpy,solarjoe/numpy,seberg/numpy,mingwpy/numpy,nguyentu1602/numpy,ahaldane/numpy,dimasad/numpy,madphysicist/numpy,GaZ3ll3/numpy,ChanderG/numpy,Anwesh43/numpy,andsor/numpy,shoyer/numpy,jakirkham/numpy,sinhrks/numpy,rudimeier/numpy,ViralLeadership/numpy,sinhrks/numpy,grlee77/numpy,stuarteberg/numpy,charris/numpy,kiwifb/numpy,ajdawson/numpy,ESSS/numpy,bringingheavendown/numpy,gfyoung/numpy,ViralLeadership/numpy,pelson/numpy,pbrod/numpy,drasmuss/numpy,ahaldane/numpy,leifdenby/numpy,madphysicist/numpy,stuarteberg/numpy,rudimeier/numpy,mathdd/numpy,rherault-insa/numpy,maniteja123/numpy,ogrisel/numpy,solarjoe/numpy,behzadnouri/numpy,utke1/numpy,dwf/numpy,rgommers/numpy,sigma-random/numpy,stefanv/numpy,pdebuyl/numpy,shoyer/numpy,Eric89GXL/numpy,ewmoore/numpy,ekalosak/numpy